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Date: Wed, 13 Jun 2007 21:00:52 -0700 (PDT)
From: bansi <mail2bansi@yahoo.com>
To: users@myfaces.apache.org
Subject: Re: How to Re-Initialize JSF Backing Bean on Form Submit
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 <bc36a6210706131555v1f3c0978n4aaeccd80d5e5178@mail.gmail.com>
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 <bc36a6210706131708w71ed838di5c4cbea534138992@mail.gmail.com>


Thanks Andrew. As very correctly suggested by you i already have the code in
backing bean to clear the backing bean properties. But the problem is when i
move back and forth (i.e. navigate) from Current page to Other pages and 
come back to Current page, i want the backing bean associated with the
current page to be re-created i.e. new instance of backing bean.
Ofcourse i wanna clear the data on form fields


Andrew Robinson-5 wrote:
> 
> I didn't mean to clear the form, but clear the backing bean properties.
> 
> public class MyBean {
>   private MyObject myObject;
> 
>   public String save() {
>     // EntityManager or hibernate session save here
>     // clear the properties:
>     clearState();
>   }
> 
>   public void onCancel(ActionEvent evt) {
>     clearState();
>   }
> 
>   private void clearState() {
>     myObject = null;
>   }
> }
> 
> On 6/13/07, bansi <mail2bansi@yahoo.com> wrote:
>>
>> I figured out that i can do something like this ...
>> In session scope, only one instance of the backing bean will be used
>> during
>> the whole browser session. When you want to recreate the managed bean
>> inside
>> the backing bean during session, then do
>> FacesContext
>>    .getCurrentInstance()
>>       .getExternalContext()
>>          .getSessionMap()
>>             .put("myBean", new MyBean());
>>
>> BUT i am not sure where to put this snippet of code.
>>
>>
>>
>> bansi wrote:
>> >
>> > Andrew
>> > I totally agree with you on "its the desired behavior of a session bean
>> --
>> > one instance for the
>> > user's session"
>> > But is their a way to recreate the instance of backing bean  in
>> following
>> > situations
>> > 1) Whenever a new record is inserted into database. The reason i
>> mention
>> > this is my backing bean instantiates the pojo and for subsequent save
>> into
>> > database the backing bean holds onto the old instance of pojo having
>> same
>> > identifier (ID) value. This is exactly the reason Hibernate throws
>> > Detached Object Exception passed to Persist
>> >
>> > 2) Whenever i  navigate between JSF pages , i wanna backing bean to be
>> > re-initialized i.e. re-created with new instance
>> >
>> > Please note as suggested by you i am not looking to clear off the
>> fields
>> > on the form whereas i want to recreate the whole backing bean itself
>> >
>> > Any pointers/suggestions highly appreciated
>> >
>> > Regards
>> > Bansi
>> >
>> >
>> > Andrew Robinson-5 wrote:
>> >>
>> >> That is the desired behavior of a session bean -- one instance for the
>> >> user's session. If you want to use session, and have it be able to be
>> >> cleared, then you will want to create a clear action or action
>> >> listener method that clears all of the member variables when executed.
>> >>
>> >> I would instead recommend using conversational scope from JBoss-Seam
>> >> or MyFaces or request scope and use saveState as needed to persist
>> >> values across pages.
>> >>
>> >> -Andrew
>> >>
>> >> On 6/13/07, bansi <mail2bansi@yahoo.com> wrote:
>> >>>
>> >>> We have backing bean defined in "session" scope
>> >>> So whenever we do a submit on JSF Form, it holds onto same backing
>> bean.
>> >>> This is not desirable as
>> >>> -> The Form will have  different set of values each time it does a
>> >>> submit
>> >>> -> The Backing bean has variable defined to instantiate a POJO
>> >>> i.e.private
>> >>> MyPojo pojo = new MyPojo();
>> >>> So every time JSF form submits to the backing bean, it holds onto the
>> >>> same
>> >>> instance of POJO which eventually results in insertion problems into
>> >>> database i.e. having same Identifier (ID) value
>> >>> -> The same problem occurs if i navigate to different page and come
>> back
>> >>> to
>> >>> original page
>> >>>
>> >>> Is their a way to re-initialize the Backing Bean ???
>> >>> --
>> >>> View this message in context:
>> >>>
>> http://www.nabble.com/How-to-Re-Initialize-JSF-Backing-Bean-on-Form-Submit-tf3918359.html#a11110517
>> >>> Sent from the MyFaces - Users mailing list archive at Nabble.com.
>> >>>
>> >>>
>> >>
>> >>
>> >
>> >
>>
>> --
>> View this message in context:
>> http://www.nabble.com/How-to-Re-Initialize-JSF-Backing-Bean-on-Form-Submit-tf3918359.html#a11111042
>> Sent from the MyFaces - Users mailing list archive at Nabble.com.
>>
>>
> 
> 

-- 
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